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Question:

Which one of the following cellular parts is correctly described?

Centrioles - sites for active RNA synthesis.

Thylakoids - flattened membranous sacs forming the grana of chloroplasts.

Ribosomes - those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).

Lysosomes- optically active at a pH of about 8.5

Solution:

A thylakoid is a membrane-bound, flattened compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen.